Raleigh RM1/RM2 Sturmey-Archer engine. Drive
pulley extractor 1"BSF×10tpi (internal
thread)—£20 each.Note: please don't try to prise this
pulley off instead! They're always very tight on the
shaft. The pulley is made of brittle cast iron and snaps
like a biscuit, then it's a bit late to find out that
replacements are practically unobtainable.